Polycarboxylic acid cement grinding aid production method

Abstract

The present invention relates to a polycarboxylic acid cement grinding aid production method, which comprises: 1, adding maleic anhydride, ethylene glycol, polyethylene glycol, allyl polyethylene glycol, methacrylic acid, a catalyst benzenesulfonic acid, a polymerization inhibitor hydroquinone and an initiator benzoyl peroxide to a reaction kettle, stirring, heating to a temperature of 65-75 DEG C so as to carry out an esterification reaction, maintaining the reaction temperature for 2.5-3 h, and heating to a temperature of 100-120 DEG C so as to carry out a polymerization reaction to obtain a polycarboxylic acid cement grinding aid; and 2, after completing the reaction, adding sulfamic acid and a catalyst fluoroantimonic acid to obtain the modified polycarboxylic acid cement grinding aid. According to the present invention, the efficient polycarboxylic acid cement grinding aid function controlled design method is provided, and the grafting density of the short and long side chains and the molecular weight of the long side chains are adjusted so as to achieve controllability of the key parameters of the cement particle dispersion process and the cement hydration process, achieve the function compounding, and ensure the compatibility of the cement grinding aid and the concrete admixture.

Description

technical field [0001] The invention relates to a production method of a polycarboxylate cement grinding aid. Background technique [0002] In cement grinding, mechanical methods are used to make cement micronized, which is a process of particle size change and mechanochemical change. When the cement clinker, admixture and gypsum mixture are fed into the mill, they are usually subjected to different types of stress during the crushing process, which will cause the valence bond inside the particle to break, resulting in a difference in electron density, forming on both sides of the cross-section A series of staggered active points. For cement clinker, Si-O bonds and Ca-O bonds are involved. During grinding, the fracture of particles occurs first and largely on Ca-O ionic bonds. Due to the breakage of ionic bonds, a series of Ca 2+ and O 2- active point. When there are no external ions or molecules to shield these active points, the active points will attract each other, ...

AI Technical Summary

Problems solved by technology

However, since these substances have not been polymerized into the polymer grinding aid and have not formed a covalent bond with the polymer grinding aid, the change of their water properties is unstable.

Images